Influência de ondas de instabilidade tropical na camada de mistura da região equatorial do Oceano Atlântico

Abstract

The objective of this work was the study of tropical instability waves (TIWs) on the surface and in the water column of the Equatorial Atlantic Ocean. The TIWs are planetary waves that influence the interactions between the ocean and the atmosphere. They influence heat and influence on biota. These waves are well documented in the Pacific Ocean, but studies in the Atlantic are still few. Therefore, this work had as objective to observe the variations found by the ARGO derivers and compare them to the literature. For the methodology of the study parameters of salinity and temperature were analyzed between the years of 2003 to 2016 through the ARGO shunters and data of the 20º C isotherm of the PIRATA buoys. In addition, the localization of ARGO in cusp formations was observed. The formation of cusps was identified mainly between June, July and August, but may extend until September or begin earlier in May. It was possible to identify the influences of TIWs in the Atlantic Ocean, in variations consistent with the literature. In addition, it was possible to identify variations caused by extreme events, such as the year 2008, with occurrence of La niña events that had a shorter formation period of chlorophyll-a feathers. The average 8-day period in the images in the color of the oceno does not seem ideal, considering that the propagation of this wave is of approximately 50 cm / s. But the current satellites do not provide a daily quality spatial resolution for the studies.